Compound for hardening steel and other metals.



W. BRENNAN, G16 PHILALEELPHIE AND IwZIfiT-IAIETM MEEHAIT, 0F WILLIAMS- Til) VI-XE, EENHSYL IAEHLEM GUMIGUND FOR Ho Drawing.

T0 aZZ whom may emcee n:

Be itkn'oom that \FJB?-PATRICK BREN- NAN and EL -QIQHAEL Mea an, citizens of United. States, resitiing at hiiadeiphia, in the county Phifiadolghia, and Wiiliems town, in the county of Dauphin, tiveiy, State of Pennsylvania, have invented new and useful L'nprovemente in Compounds for Hardening Steel and other Metals, of which the ffoiiowing is a specifioziiion.

Ominvention pereoins to the hai'dening and toughening; of steel and other metals, and consists a compoumi u of the following constituents, combined in the pro portions stated, -viz:

Cyanid of potassium {powdered}- 52 ounces.

Bicarbonet OkSOdil 1 ounce. Biombaamce oipoiassmm (powdered) i hardene dressed heated to a. oil-err);

ed, and is fihen roiled in or otherwise sub jected to the action of the w dening oom- HAREEEEINQ $3.3m OTHER PiZETALfi.

Application fiieii December e, 1912. Serial No. seem.

pound until the steel or other mesa becomes dark. The whole 18 then returned-lo the and neat-ed until it 13 a, dark red, whereupon ii is plunged in water until it is cold.

In the manner described stool anti other metal can be expeciitiously hardened mic} toughened to a material extent by a novice; it being; simply necessaryto properly heat the article before the immersion thereof 1n wateir to otherwise follow the direcioos tiaiiy dCSCIibGd and for the purpose speci-.

iii testimony "whereof we have hereunto set our hands in presence of two subscribing Witnesses.

' PATRICK N. BRENNAN;-

EHCHAEL MEEHAN. Witnesses 2 BLANMNQ V BLANNZNQ, 

